RUSTSEC-2026-0406 Use-after-free when changing a multithreaded context with an unfinished frame

When a multithreaded frame zstdmt feature, CParameter::NbWorkers is left unfinished, its jobs may still be running on the worker threads: the C library only waits for them when the next frame starts, or when the context is freed. A session reset makes the context accept changes again in the...